115200 Baud to 9600 Baud Translator

[ScottC]

yes,

I am still using 22.1184 XTAL. I undersatand what you are saying, from what info I gathered, this or 11.something, 1/2 of 22.1184, or an 18.432 xtal is what you want for error free reception. I am still new at this so I'm still in the learnig curve. But it makes sense what you are saying. I am going to try changing the SPBRG later in the program using DEFINE HSER_BAUD 9600, and DEFINE HSER_SPBRG 143 to change the valuse. I compiled it, have not tested yet, I'll get to in a bit see if that works. What do you think?

Scott

[Bruce]

With HSERIN/HSEROUT you can change the data-rate by writing directly to SPBRG.

Here:
    SPBRG = 129 ' 9600 @20MHz
    HSEROUT ["TEST AT 9600",13,10]
    PAUSE 10
    SPBRG = 64 ' 19200 @20MHz
    PAUSE 5000 ' Time to switch terminal program from 9600 to 19200
    HSEROUT ["TEST AT 19200",13,10]
    PAUSE 5000
    GOTO Here

You can't change DEFINEs at run time, so just write to SPBRG directly if you want to change data-rates with HSEROUT/HSERIN.

With DEBUG/DEBUGIN the data-rate & pins used are fixed, you can't change data-rates on the fly, and you'll want your osc frequency as close as possible to whatever you have it DEFINEed as.

[Ingvar]

OK, think about it .... you're running your pic at 22.1184MHz, PBP thinks it's running at 20MHz. You'll actually run 22.1184/20=1.10592 times too fast. You need to lower your baudrate by this factor to get DEBUGIN to run at the correct speed. 9600/1.10592=8681 should do the trick.